open atrium

In one word: Awesome.

This Drupal distribution truly displays the beauty and power of Drupal—a dedicated team over at Development Seed spent a lot of time making a great Intranet-in-a-box solution built on top of Drupal, and even though it's a simple set of modules and an installation profile, you'd have to do a little digging to tell if an Open Atrium site even runs on Drupal!